Circulatory System Chapter 2.2 Notes Part 2

Parts of the Heart Heart – left-right are reversed in diagrams (diagram p. 88) pumps 4L of blood/minute muscular organ in the C. sys. 4 chambers – top – atria – bottom – ventricles Atria – collect blood – Ventricles – pump blood Left Ventricle – pumps blood to the body Right Ventricle - pumps blood to the lungs Valves – found between chambers – blood only flows one way When valves close – we hear the “lub-dub”

Inside the Human Heart

Three Types of Blood Vessels Blood carried from heart to your body and back again using blood vessels: Three types of blood vessels: Arteries Capillaries Veins

Inside of the blood vessels

Arteries Arteries – away from the heart (aorta to arterioles) Red – oxygenated blood Thick walls due to pressure Pulmonary artery – only artery to carry deoxygenated blood – to lungs

Veins Veins – to the heart (superior/anterior vena cava – venules) Blue – deoxygenated blood Thinner and have valves Pulmonary vein – only vein to carry oxygenated blood - from lungs

Capillaries Capillaries – one cell thick mass between veins and arteries where nutrients/oxygen/glucose are exchanged to the cells from your blood

What does Our Blood Do? transports oxygen, nutrients, & water to your cells carries carbon dioxide & wastes away from your cells

Components of Blood Body contains 5L of blood 55% = plasma – clear, yellowish fluid containing proteins and minerals 45% = red blood cells, white blood cells, & platelets

What Does Each Part Do? Red blood cells are made in bone marrow, liver, and spleen Red blood cells contain haemoglobin and are responsible for transporting the O2 and CO2 White blood cells – fight infection Platelets – clot blood

Your Turn! Textbook Questions P. 95 Circulatory System stuff #1-6, 11, 13, 15 Quiz next class!